失败的代码，因为没有考虑数组和集合的情况~ !!!

class FormatPrintf{
    public static<T> void print(T t)throws Exception{
        if(isPrimitive(t.getClass())){
            System.out.println(t);
        }
        System.out.println("{");
        dfs(t,0);
        System.out.println("}");
    }
    private static<T> void dfs(T t,int def)throws Exception{
        def++;
        Class<?> clazz = t.getClass();
        Field[] fields=clazz.getDeclaredFields();
        for(Field f:fields){
            f.setAccessible(true);
            Object obj=f.get(t);
            printfSpace(def);
            System.out.print(f.getName());
            if(obj==null||isPrimitive(obj.getClass())){
                System.out.println(": "+obj);
            }else{
                System.out.println(": {");
                dfs(obj,def);
                printfSpace(def);
                System.out.println("}");
            }
        }
    }
    private static<T> boolean isPrimitive(Class<T> clazz) {
        if (clazz.isPrimitive() || clazz.getSuperclass() == Number.class
                || clazz == Boolean.class || clazz == String.class
                || clazz == Date.class) {
            return true;
        }else {
            return false;
        }
    }
    private static void printfSpace(int def){
        for(int i=0;i<def;i++){
            System.out.print("\t");
        }
    }
}

调用printf方法

{
	id: 12134
	name: 姓名
	address: {
		id: 1
		detal: 地址
		empty: null
		point: {
			id: 123
			ad: ad
			date: Wed Aug 19 16:58:15 CST 2020
		}
	}
}